Coupling for attaching a rotatable shaft to a nozzle



COUPLING FOR ATIACHING A ROTATABLE I SHAFT TO NGZZLE Jacob JoseePog'rebniak, Fairfax, Calif. l,Application December 2, 1955, SerialNo.'550,671

s claims. (cl. 2614-761 The present invention relates to a coupling forattaching a rotatable shaft to a nozzle.

An object of the present invention is to provide a coupling forattaching a rotatable shaft to a nozzle which has means `fortransferring iluid from a nozzle located on the end of a fixed supplyline to a rotating shaft without leakage and without producing excessiveheat due to friction.

Another object of the present invention is to provide a coupling forattaching a rotatable shaft to a nozzle which has means for creating anarea of negative pressure at the inlet end of the rotating shaft and formixing air with a uid as it is transferred from a nozzle on the end of alixed supply line to the rotating shaft.

A further object of the present invention is to provide a coupling forattaching a rotatable shaft to a nozzle which is of simple structure,sturdy in construction with no movingparts vand one which iseconomically feasible.

These and other objects and advantages of the present invention will befully apparent from the following description when taken in connectionwith the annexed drawing, in which:

Figure 1 is an elevational view of an oil burner showing the coupling ofthe present invention inst-alled thereon and connected by a conduit tothe burner fuel pump,

Figure 2 is a sectional view, on an enlarged scale, of a portion of theassembly of Figure 1,

Figure 3 is a sectional view, taken on the line 3-3 of Figure 2,

Figure 4 is a sectional view, taken on the line 4-4 of Figure 2, and

Figure 5 is a sectional view, on a reducedscale, of another form of thecoupling of the present invention.

Referring in greater detail to the drawing in which like numeralsindicate like parts throughout the several views, the coupling of thepresent invention is designated generally by the reference numeral andis for use with an oil burner shown in Figure l and designated by thereference numeral 11. The oil burner 11 has a hollow rotatable shaft 12,shown in dotted lines in Figure l, and an outwardly-flaring atomizer cup13 is carried on one end of the shaft within a nozzle structureincluding a nozzle protector 14. When in use, the cup 13 and protector14 are within the furnace or boiler indicated by a dotted line in Figure1 as at 15.

A nozzle 16 is arranged in spaced end to end relation with respect tothe hollow rotatable shaft 12, the coupling 10 having the portion 17adjacent one end embracingly receiving the portion 18 of the shaft 12adjacent one end thereof and having the portion 19 adjacent the otherend embracingly receiving the nozzle 16.

A passage 21 extends transversely of the coupling 10 from one side tothe other side intermediate the end portions 17 and 19 and is incommunication with the space between the nozzle 16 and the adjacent wallof the shaft portion 18 for introducing air into the hollow rotatableshaft 1,2 forwardly of the nozzle 16. Means is ICC providedl connectingthe-nozzle 16 to asource of fue! oil ,underA pressure. -Specificallythis means includes a male coupling element 22threadedly` receivedwithin Y the portion 19 of thecoupling 10 and connected to one end of aconduit 23, the other end of the conduit 23* beingvconnected to the fuelpump 24 mounted upon the oil burner 11 and driven by the motor of theoil burner, the motor being indicated bythe numeral `25.

A` post 26 is arranged coaxially of and spaced from 0 the nozzle 16 andis supported by one endin a spider 45 positioned within the coupling 10.The post 26 has kan `outwardly flaring portion 27 adjacent its other endprojecting from the nozzle 16.

A, sleeve bearing 28 covers the portion 18 of the shaft 12 and 'restsinthe portion 17 of the coupling 10. An `oil seal 29, manually pressedinto place, is interposed between the portion 17 of the coupling 10 andthe sleeve bearing 28. The shaft 12 is supported in bearings 30 and 31,as seen in Figure 1.

` In -the form of the invention shown 'in Figure 5, the' coupling 32includes a portion 33 adjacent one end embracingly receiving a portion34 of a shaft 35 and a portion 36 adjacent the other end having a nozzle37 formed integrally therein. A post 38 is arranged coaxially within thenozzle 37 and has a portion adjacent one end flaring outwardly asindicated by the ref erence numeral 39.' The coupling 32 is providedwith internal threads 41 within its portion 36 for attachment of a malecoupling element such as that shown in Figure 2 and indicated by thereference numeral 23 for connecting the coupling 32 to a source of fluidor fuel oil under pressure. A sleeve 42 carried within the portion 33 ofthe coupling 32 covers the portion 34 of the shaft 35.

In each of the embodiments of the coupling of the present inventionshown herein described, the posts 26 and 38 are supported upon a spider45, as seen in Figure'4, the spider having a plurality of passages 46for the passage of oil and a transversely-arranged slot 47 for thereception of the end of a screwdriver for positioning the spider withinthe respective one of the couplings. Inthe embodiment shown in Figure 5,the coupling 32 has a passage 48 extending transversely inwardly fromone side of the coupling 32 intermediate the portions 33 and 36, thepassage being in communication'with the space between the nozzle 37 andthe portion 34 of the shaft 35. Air is introduced through the passage48'into the space between the nozzle 37 and the portion 34 ofthe shaft35 and is mixed with fuel oil owing .through the space between thevnozzle 37 and .the post 38. In the embodiment shown in Figure 2, thesame action takes place, the air being admitted through the passage 21and is mixed with oil flowing between the nozzle 16 and shaft end 18.The outwardly-flaring portions of each of the posts 26 and 38 servesfurther to spread the flow of oil outwardly to be mixed thoroughly withthe air flowing between the shaft end portion and the respective nozzle.This causes a negative pressure to be created in the coupling which isessential to prevent leaking of oil and allows the use of a liberalclearance around the shaft at the same time.

What is claimed is:

1. The combination with a hollow rotatable shaft and a nozzle arrangedin spaced end to end relation with respect to said shaft, of a couplinghaving the portion adjacent one end embracingly receiving a portion ofsaid shaft adjacent one end thereof and having the portion adjacent theother end embracingly receiving said nozzle, said nozzle being arrangedso that it extends into and is spaced from said one end shaft portion,there being a passage extending transversely inwardly from one side ofsaid coupling intermediate said end portions and in Patented Feb. 2,1960 oommunicationwiththe"space-betweensaid-nozzle@ e 1 said one endshaft portion @or introducing air into said hollow shaft forwardlyofs'id no zzle, and meanseonnectin'g'saidenozzle 1to a source' offnelrroil-nderlfpressureiw afhn'ozzlefarranged-1 1in-r spaced jvendftov-end relation withj@ respectV to saidA shaft;` of afcouplingvhaving the jportion; l adjacent-one e'nd embracingly receivinga portionfoffsaid-l shaft'adjacentoneV end thereof andhaving;thesportionjfV adjacent the otherY end'.embraeinglyreceiving`said nozzle; 10

said nozzle being arrangediso that itfextendsinto and is spaced V`-fromsaid` one V-endf-shaftportion, there fbei'ng" Aav passageextending--'transverselyfffrrn one; Iside to thee-other# side of" saidcoupling Y intermediatey said 'end portions and" f afeaaguaa;

adjacenteonendembraeinglyreceiving'aeportiomosaidm shaft adjacent oneend thereof and havinglthe portion adjaeentthe other end embracinglyreceiving said nozzle, said nozzle being arranged so that it extendsinto and is spaced from said one end shaft portion, there being apassage extending transversely `inwardly from one side` Vof` s'aidcoupling (intermediate-said end portions and in communatomwith.tlwaSpage. between 4Said- 111191de. rand said one end shaftlportionionintroducing air into said hollow shaft.forwardlyosaidnozzle, meansconnecting said nozzle to a sourcefoffuel-oilunderpressure, and a post,arrangedscoaxiallyfvtaand @par d-;from;-:said;fpozz1e and supportedbynoxne end in" a spideii `positioned Within said coupling andhavig-a`po`rtiox1^"`adjacent its other end t which flares outwardly andprojects from said nozzle.

References Citedin the le of thishpatent p UNiTnDA s-TATEsiPATENTsjf

